Update array.pony
Update array.pony

https://www.cs.cmu.edu/~adamchik/15-121/lectures/Stacks%20and%20Queues/Stacks%20and%20Queues.html
kulibali/ponyc,cquinn/ponyc,cquinn/ponyc,dipinhora/ponyc,sgebbie/ponyc,jemc/ponyc,dipinhora/ponyc,ponylang/ponyc,sgebbie/ponyc,dipinhora/ponyc,kulibali/ponyc,sgebbie/ponyc,kulibali/ponyc,jemc/ponyc,sgebbie/ponyc,ponylang/ponyc,cquinn/ponyc,jemc/ponyc,sgebbie/ponyc,kulibali/ponyc,ponylang/ponyc,cquinn/ponyc